Rev. #4 of the BMW manual (they are now up to at least rev. #6 but I don't have it... )
calls for locktite #243 on the front sprocket bolt, with torque of 50Nm
On rear sprocket it says to use new nuts (they are some sort of special mechanical locking nuts),
and are to be TTA (Torqued to Angle) 10Nm seating torque, TTA of90 degrees.
But again my manual is potentially down-level ...
You'd think that for $120 I'd get free updates but nooooooooooooo